Last year, 10 percent of all teenagers purchased a new iPhone. This year, a sample of 260 randomly chosen teenagers showed that 39 had purchased a new iPhone. To test whether the percentage has risen, the critical value at α = .05 is:

Question

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The critical value for a one-tailed test at α = 0.05 is 1.645. This is used to determine if the sample proportion significantly exceeds the hypothesized population proportion.

Last Year, 10 Percent of All Teenagers Purchased a New